Having some beers this weekend in tribute to this thread and @Parkofadown who is probably at some park enjoying the extended weekend telling people how to do their jobs and that it’s their fault he got his boat stuck at the boat launch, not his.
That's not the ROM ID, plus the ROM ID changes with updates.
Supra ROM ID's start with R4C9 with 5 digits after that that are unique, and SWFL ID's start with 5D55
Example: My 2020 is currently R4C9H6S8B and 5D553CAA08
Great, glad you got it working. Mine said unlock needed as well but it flashed just fine. If you didn't have the recall done and don't have full screen carplay you could probably flash it just fine. If you do have full screen carplay, then yea, you need an unlocker.
Classic narcissistic signs. Nothing they do causes the problems, it's everyone else. They are the victim, everyone else is wrong. Other people aren't telling them the truth.